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<a class="parent" href="../index.html">neox</a>
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<a href='#section-0'>#</a>
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</div>
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<h1>Cache for Intermediate Activations</h1>
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<p>During inference the model outputs token by token. We use this simple cache to store key's and value's attention layers, so that we don't have to recompute them for previous tokens.</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">15</span><span></span><span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Any</span></pre></div>
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<div class='section' id='section-1'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-1'>#</a>
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</div>
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<h2>Cache</h2>
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<p>This maintains a key-value cache and queues push values and pop them in the same order. The queues are useful since we have multiple attention layers.</p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">18</span><span class="k">class</span> <span class="nc">Cache</span><span class="p">:</span></pre></div>
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<a href='#section-2'>#</a>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">26</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
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<span class="lineno">27</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span> <span class="o">=</span> <span class="p">{}</span></pre></div>
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<div class='section' id='section-3'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-3'>#</a>
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</div>
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<h3>Clear cache</h3>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">29</span> <span class="k">def</span> <span class="nf">clear_all</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span></pre></div>
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<div class='section' id='section-4'>
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<div class='docs'>
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<a href='#section-4'>#</a>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">33</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span> <span class="o">=</span> <span class="p">{}</span></pre></div>
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<div class='section' id='section-5'>
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<div class='docs doc-strings'>
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<a href='#section-5'>#</a>
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<h3>Push a value to a queue</h3>
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<ul><li><code class="highlight"><span></span><span class="n">name</span></code>
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is the name of the queue </li>
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<li><code class="highlight"><span></span><span class="n">value</span></code>
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is the value to be pushed</li></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">35</span> <span class="k">def</span> <span class="nf">push</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">value</span><span class="p">:</span> <span class="n">Any</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-6'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-6'>#</a>
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</div>
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<p>Create an empty queue if it's not present </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">44</span> <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">:</span>
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<span class="lineno">45</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">[</span><span class="n">name</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-7'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-7'>#</a>
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<p>Push to the queue </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">48</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">[</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></pre></div>
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</div>
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<div class='section' id='section-8'>
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<div class='docs doc-strings'>
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<a href='#section-8'>#</a>
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</div>
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<h3>Return the size of the queue</h3>
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<ul><li><code class="highlight"><span></span><span class="n">name</span></code>
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is the name of the queue </li>
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<p><em>Returns</em> size of the queue if exists else None</p></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">50</span> <span class="k">def</span> <span class="nf">q_size</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span></pre></div>
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</div>
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<div class='section' id='section-9'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-9'>#</a>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">58</span> <span class="k">if</span> <span class="n">name</span> <span class="ow">not</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">:</span>
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<span class="lineno">59</span> <span class="k">return</span> <span class="kc">None</span>
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<span class="lineno">60</span>
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<span class="lineno">61</span> <span class="k">if</span> <span class="nb">type</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">[</span><span class="n">name</span><span class="p">])</span> <span class="o">!=</span> <span class="nb">list</span><span class="p">:</span>
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<span class="lineno">62</span> <span class="k">return</span> <span class="kc">None</span>
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<span class="lineno">63</span>
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<span class="lineno">64</span> <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">[</span><span class="n">name</span><span class="p">])</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-10'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-10'>#</a>
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</div>
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<h3>Pop from a queue</h3>
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<ul><li><code class="highlight"><span></span><span class="n">name</span></code>
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is the name of the queue </li>
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<p><em>Returns</em> the value</p></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">66</span> <span class="k">def</span> <span class="nf">pop</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span></pre></div>
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<div class='section' id='section-11'>
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<div class='docs'>
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<a href='#section-11'>#</a>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">73</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">[</span><span class="n">name</span><span class="p">]</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span></pre></div>
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</div>
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<div class='section' id='section-12'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-12'>#</a>
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</div>
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<h3>Cache a value</h3>
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<ul><li><code class="highlight"><span></span><span class="n">key</span></code>
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is the name of the value to be cached </li>
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<li><code class="highlight"><span></span><span class="n">value</span></code>
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is the value</li></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">75</span> <span class="k">def</span> <span class="nf">set</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">value</span><span class="p">:</span> <span class="n">Any</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-13'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-13'>#</a>
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</div>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">82</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">[</span><span class="n">key</span><span class="p">]</span> <span class="o">=</span> <span class="n">value</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-14'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-14'>#</a>
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</div>
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<h3>Retrieve a value from cache</h3>
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<ul><li><code class="highlight"><span></span><span class="n">key</span></code>
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is the name used when caching </li>
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<li><code class="highlight"><span></span><span class="n">default</span></code>
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is the default value if the cache is empty </li>
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<p><em>Returns</em> the cached value</p></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">84</span> <span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">default</span><span class="p">:</span> <span class="n">Any</span> <span class="o">=</span> <span class="kc">None</span><span class="p">):</span></pre></div>
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</div>
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<div class='section' id='section-15'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-15'>#</a>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">92</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">key</span><span class="p">,</span> <span class="n">default</span><span class="p">)</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-16'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-16'>#</a>
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</div>
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<h3>Clear a cache value</h3>
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<ul><li><code class="highlight"><span></span><span class="n">key</span></code>
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is the name used when caching</li></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">94</span> <span class="k">def</span> <span class="nf">clear</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-17'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-17'>#</a>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">100</span> <span class="k">del</span> <span class="bp">self</span><span class="o">.</span><span class="n">_cache</span><span class="p">[</span><span class="n">key</span><span class="p">]</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-18'>
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<div class='docs'>
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<div class='section-link'>
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<a href='#section-18'>#</a>
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</div>
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<p>Singleton for cache </p>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">104</span><span class="n">_INSTANCE</span> <span class="o">=</span> <span class="kc">None</span></pre></div>
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</div>
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</div>
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<div class='section' id='section-19'>
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<div class='docs doc-strings'>
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<div class='section-link'>
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<a href='#section-19'>#</a>
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</div>
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<h3>Get the cache instance</h3>
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<ul><p><em>Returns</em> the cache instance</p></ul>
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</div>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">107</span><span class="k">def</span> <span class="nf">get_cache</span><span class="p">()</span> <span class="o">-></span> <span class="n">Cache</span><span class="p">:</span></pre></div>
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</div>
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<div class='section' id='section-20'>
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<div class='docs'>
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<a href='#section-20'>#</a>
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<div class='code'>
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<div class="highlight"><pre><span class="lineno">113</span> <span class="k">global</span> <span class="n">_INSTANCE</span>
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<span class="lineno">114</span>
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<span class="lineno">115</span> <span class="k">if</span> <span class="n">_INSTANCE</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
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<span class="lineno">116</span> <span class="n">_INSTANCE</span> <span class="o">=</span> <span class="n">Cache</span><span class="p">()</span>
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<span class="lineno">117</span>
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<span class="lineno">118</span> <span class="k">return</span> <span class="n">_INSTANCE</span></pre></div>
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